Derivative Instruments and Hedging Strategies - Summary of Derivatives Not Designated as Hedging Instruments Outstanding (Detail) - Not Designated as Hedging Instrument - Foreign exchange contracts - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Sell
Derivative [Line Items]
Notional amount	$ 41,031	$ 77,335
Purchase
Derivative [Line Items]
Notional amount	$ 30,031	$ 30,818